Hello Kartu, thank you for joining this thread!
I don't know what happened to it in the first place as the ereader is my mother's. She's not in any way technically minded so probably what happened is it was accessing a book when running low on battery? When she gave it to me saying it didn't work, it said 'firmware update has failed', before that it was working properly for years. A long time ago I did put PRS+ on as she wanted a clock and the pages were refreshing slowly. It was taken off again soon after, I forget why. So I have done this before successfully in the past
How do I access the file that gives the MD5 error? Is it in the /tmp/ directory? Or do I copy the one from /Sony Reader/ back to the desktop and compare that to the one I have downloaded?